861049663 has 2 divisors, whose sum is σ = 861049664. Its totient is φ = 861049662.

The previous prime is 861049661. The next prime is 861049669. The reversal of 861049663 is 366940168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861049663 - 2¹ = 861049661 is a prime.

Together with 861049661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861049661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430524831 + 430524832.

It is an arithmetic number, because the mean of its divisors is an integer number (430524832).

Almost surely, 2^861049663 is an apocalyptic number.

861049663 is a deficient number, since it is larger than the sum of its proper divisors (1).

861049663 is an equidigital number, since it uses as much as digits as its factorization.

861049663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 861049663 is about 29343.6477452957. The cubic root of 861049663 is about 951.3552818697.

The spelling of 861049663 in words is "eight hundred sixty-one million, forty-nine thousand, six hundred sixty-three".